The basic principle, major controlled process condition, mining process and its characteristics of selective leaching are analyzed. It is a clean mining process of high efficiency.

本文分析了选择性溶浸法开采钾盐矿的基本原理、主要控制的工艺条件、开采工艺流程及其特点，它是一种清洁、高效的开采工艺。

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It says Poland really must do something about its inefficient and subsidised mining and farming, and clean up its filthy environment.

ECONOMIST: The Poles bargain with Europe